Undercover cop investigates disappearance of mother tied to cult, unraveling dark pagan rituals involving her strange children at secluded country house.

A police-officer goes undercover at a secluded country house to investigate the mysterious disappearance of 'Mrs Downing', the mother of three strange children who are part of a secretive cult. But as she begins to investigate she is drawn into a dark world of nightmarish pagan superstition.